Add a Discord bot to announce updates

[j005u]

While we still have relatively few packages I think it'd be a good idea to make a Discord channel (and an associated role to subscribe to pings?) where a bot would announce any package updates with the release notes grabbed from the appropriate repo/linked to.

One simple (and flexible) way of doing this is via Apprise: https://github.com/caronc/apprise

I've created the #updates channel and will DM @stylesuxx the appropriate token.